Parkinson's disease protein 7 protected against oxidative stress of myocardial infarction direct through p47phox and nicotinamide adenine dinucleotide phosphate oxidase 4.

In the present study, we aimed to investigate the role and mechanism of Parkinson's disease protein 7 (Park7) in myocardial infarction (MI). The Park7 expression in the serum and tissues was down-regulated in mice with MI. Recombinant Park7 protein protected against MI-induced injury and reduced oxidative stress in mice model. Conversely, knockout Park7 increased injury of MI and promoted oxidative stress in MI mice model. In embryonic rat cardiac myoblasts H9c2 cells, over-expression of Park7 reduced reactive oxygen species (ROS)-induced oxidative stress, while down-regulation of Park7 increased ROS-induced oxidative stress. Park7 combined nicotinamide adenine dinucleotide phosphate (NADPH) oxidase cytoplasmic subunit p47phox protein had direct effect on inducing NADPH activator. The inhibition of p47phox reduced the effects of Park7 in ROS production of HO-treated H9c2 cells. The regulation of NADPH participated in the effects of Park7 on ROS production of in both MI mice model and HO-treated H9c2 cells. Our data demonstrated that Park7 protects against oxidative stress in MI model direct through p47phox and NADPH oxidase 4.